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D115 Objective Assessment (Latest Update 2026 Advanced Pathophysiology for
the Advanced Practice Nurse
Question 1
Which cellular change marks the point at which ischemic injury becomes irreversible?
A. Cellular swelling
B. ATP depletion
C. Mitochondrial membrane damage
D. Increased anaerobic glycolysis
Correct Answer: C
Rationale: Irreversible injury occurs when mitochondrial membranes are damaged, preventing
ATP generation and triggering cell death pathways.
Question 2
A patient in septic shock remains hypotensive despite aggressive fluid resuscitation. Which
mechanism is primarily responsible?
A. Decreased preload
B. Increased systemic vascular resistance
C. Nitric oxide–mediated vasodilation
D. Reduced myocardial oxygen consumption
Correct Answer: C
Rationale: Inflammatory cytokines induce nitric oxide production, causing profound
vasodilation and decreased SVR.
Question 3
Which acid–base disturbance is most likely with prolonged diarrhea?
A. Metabolic alkalosis
B. Respiratory alkalosis
C. Metabolic acidosis
D. Respiratory acidosis
practice exam 2026
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Correct Answer: C
Rationale: Loss of bicarbonate-rich intestinal fluids leads to non–anion gap metabolic acidosis.
Question 4
Which mechanism best explains polyuria in uncontrolled diabetes mellitus?
A. Decreased ADH secretion
B. Increased GFR
C. Osmotic diuresis
D. Tubular obstruction
Correct Answer: C
Rationale: Excess glucose draws water into the urine, causing osmotic diuresis.
Question 5
Which immune process is responsible for tissue injury in type III hypersensitivity reactions?
A. IgE-mediated mast cell activation
B. T-cell–mediated inflammation
C. Immune complex deposition
D. Antibody-dependent cell-mediated cytotoxicity
Correct Answer: C
Rationale: Immune complexes deposit in tissues, activating complement and inflammation.
Question 6
Which electrolyte abnormality most increases the risk of life-threatening arrhythmias?
A. Hyponatremia
B. Hyperkalemia
C. Hypophosphatemia
D. Hypermagnesemia
Correct Answer: B
Rationale: Potassium directly affects cardiac membrane potentials and conduction.
practice exam 2026
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Question 7
A patient with chronic hypoxemia develops secondary polycythemia. What is the primary
stimulus?
A. Increased plasma volume
B. Reduced erythropoietin
C. Increased erythropoietin secretion
D. Bone marrow hyperplasia
Correct Answer: C
Rationale: Hypoxia stimulates renal erythropoietin release to increase oxygen-carrying capacity.
Question 8
Which finding best differentiates cardiogenic shock from hypovolemic shock?
A. Hypotension
B. Tachycardia
C. Elevated pulmonary capillary wedge pressure
D. Decreased urine output
Correct Answer: C
Rationale: Cardiogenic shock causes elevated filling pressures due to pump failure.
Question 9
Which pulmonary change causes air trapping in emphysema?
A. Thickened alveolar membranes
B. Bronchoconstriction
C. Loss of elastic recoil
D. Increased surfactant production
Correct Answer: C
Rationale: Loss of elastic recoil impairs passive expiration.
Question 10
Which mechanism leads to hyponatremia in SIADH?
practice exam 2026
, 4|Page
A. Increased sodium excretion
B. Excess free water retention
C. Reduced thirst
D. Aldosterone deficiency
Correct Answer: B
Rationale: Excess ADH causes water retention and dilutional hyponatremia.
Question 11
Which factor initiates the acute inflammatory response?
A. Fibroblast activation
B. Mast cell degranulation
C. Neutrophil apoptosis
D. Platelet aggregation
Correct Answer: B
Rationale: Histamine release causes vasodilation and increased permeability.
Question 12
Which hormone deficiency most directly contributes to hypotension in adrenal insufficiency?
A. Cortisol
B. Aldosterone
C. Epinephrine
D. Thyroxine
Correct Answer: B
Rationale: Aldosterone deficiency leads to sodium loss and hypovolemia.
Question 13
Which mechanism underlies insulin resistance in type 2 diabetes?
A. Autoimmune beta-cell destruction
B. Reduced insulin secretion
C. Impaired insulin receptor signaling
D. Increased renal glucose excretion
practice exam 2026
D115 Objective Assessment (Latest Update 2026 Advanced Pathophysiology for
the Advanced Practice Nurse
Question 1
Which cellular change marks the point at which ischemic injury becomes irreversible?
A. Cellular swelling
B. ATP depletion
C. Mitochondrial membrane damage
D. Increased anaerobic glycolysis
Correct Answer: C
Rationale: Irreversible injury occurs when mitochondrial membranes are damaged, preventing
ATP generation and triggering cell death pathways.
Question 2
A patient in septic shock remains hypotensive despite aggressive fluid resuscitation. Which
mechanism is primarily responsible?
A. Decreased preload
B. Increased systemic vascular resistance
C. Nitric oxide–mediated vasodilation
D. Reduced myocardial oxygen consumption
Correct Answer: C
Rationale: Inflammatory cytokines induce nitric oxide production, causing profound
vasodilation and decreased SVR.
Question 3
Which acid–base disturbance is most likely with prolonged diarrhea?
A. Metabolic alkalosis
B. Respiratory alkalosis
C. Metabolic acidosis
D. Respiratory acidosis
practice exam 2026
,2|Page
Correct Answer: C
Rationale: Loss of bicarbonate-rich intestinal fluids leads to non–anion gap metabolic acidosis.
Question 4
Which mechanism best explains polyuria in uncontrolled diabetes mellitus?
A. Decreased ADH secretion
B. Increased GFR
C. Osmotic diuresis
D. Tubular obstruction
Correct Answer: C
Rationale: Excess glucose draws water into the urine, causing osmotic diuresis.
Question 5
Which immune process is responsible for tissue injury in type III hypersensitivity reactions?
A. IgE-mediated mast cell activation
B. T-cell–mediated inflammation
C. Immune complex deposition
D. Antibody-dependent cell-mediated cytotoxicity
Correct Answer: C
Rationale: Immune complexes deposit in tissues, activating complement and inflammation.
Question 6
Which electrolyte abnormality most increases the risk of life-threatening arrhythmias?
A. Hyponatremia
B. Hyperkalemia
C. Hypophosphatemia
D. Hypermagnesemia
Correct Answer: B
Rationale: Potassium directly affects cardiac membrane potentials and conduction.
practice exam 2026
,3|Page
Question 7
A patient with chronic hypoxemia develops secondary polycythemia. What is the primary
stimulus?
A. Increased plasma volume
B. Reduced erythropoietin
C. Increased erythropoietin secretion
D. Bone marrow hyperplasia
Correct Answer: C
Rationale: Hypoxia stimulates renal erythropoietin release to increase oxygen-carrying capacity.
Question 8
Which finding best differentiates cardiogenic shock from hypovolemic shock?
A. Hypotension
B. Tachycardia
C. Elevated pulmonary capillary wedge pressure
D. Decreased urine output
Correct Answer: C
Rationale: Cardiogenic shock causes elevated filling pressures due to pump failure.
Question 9
Which pulmonary change causes air trapping in emphysema?
A. Thickened alveolar membranes
B. Bronchoconstriction
C. Loss of elastic recoil
D. Increased surfactant production
Correct Answer: C
Rationale: Loss of elastic recoil impairs passive expiration.
Question 10
Which mechanism leads to hyponatremia in SIADH?
practice exam 2026
, 4|Page
A. Increased sodium excretion
B. Excess free water retention
C. Reduced thirst
D. Aldosterone deficiency
Correct Answer: B
Rationale: Excess ADH causes water retention and dilutional hyponatremia.
Question 11
Which factor initiates the acute inflammatory response?
A. Fibroblast activation
B. Mast cell degranulation
C. Neutrophil apoptosis
D. Platelet aggregation
Correct Answer: B
Rationale: Histamine release causes vasodilation and increased permeability.
Question 12
Which hormone deficiency most directly contributes to hypotension in adrenal insufficiency?
A. Cortisol
B. Aldosterone
C. Epinephrine
D. Thyroxine
Correct Answer: B
Rationale: Aldosterone deficiency leads to sodium loss and hypovolemia.
Question 13
Which mechanism underlies insulin resistance in type 2 diabetes?
A. Autoimmune beta-cell destruction
B. Reduced insulin secretion
C. Impaired insulin receptor signaling
D. Increased renal glucose excretion
practice exam 2026
